Malicious PDF — malware analysis report

Static analysis result for SHA-256 676b7d0a01683ee6…

MALICIOUS

PDF

74.8 KB Created: 2021-04-21 19:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f7405ea763547b86d1a96dbe928ae661 SHA-1: 02108ce21acdc2979a28db4147c4836f321cf5cd SHA-256: 676b7d0a01683ee6078798df053b4f31c9edcc075c3fdc2fd8fb3967f62c01d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The document body, though heavily obfuscated, contains references to 'Ez cash loan' and 'reviews', suggesting a phishing or scam lure. The presence of external URIs and the link farm nature of the document strongly suggest it is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=ez+cash+loan.net+reviews PDF link annotation
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/komapujunogudupox.pdfIn PDF document text
    • http://vamixasamuk.22web.org/elizabethan_and_jacobean_drama_study_guide.pdfIn PDF document text
    • http://divalurumewib.iblogger.org/antianginal_drugs_medicinal_chemistry.pdfIn PDF document text
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/zewoxijebex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_6024cd5e7d255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_6030a25744fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_6052423ef2292.pdfIn PDF document text
    • https://ratojomivufal.weebly.com/uploads/1/3/1/4/131453965/432959a.pdfIn PDF document text
    • https://bifugojatomawak.weebly.com/uploads/1/3/1/4/131437093/7080173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_6052d37fbd77a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_604050e9aefe1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9193858-9d61-4821-bb55-962ab0647ee6/m_audio_oxygen_25_specs.pdfIn PDF document text
    • http://wimifus.rf.gd/cosmopolitan_magazine_cover_template_psd.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_616a9129880b4c4f93c7fcabf5a6dc38.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_967a303837a74d37b10e009400918e39.pdf?index=trueIn PDF document text
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_4445f0a924d24d57afee0daff19f4c5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80b0cfd-4b98-4da1-926f-7e05969e9c1a/oster_waffle_maker_instructions_3883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeec54c1-6dc1-40e1-9119-472a3b63bff1/55802977477.pdfIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_06a88ad1de7c46368c3665211920a3e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/569cf055-5895-406c-878e-79e4fe7b27cc/pioneer_avh-2300nex_not_turning_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed014044-a75a-4dd6-9c66-76877658ce35/49935063339.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_b5285ff32300460eba39e4c58a6daccc.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 5080 bytes
SHA-256: 44ba305cb0532f5dc45ec3b8b6aa19094d6f39ffa87f84e7bf5ea75544638e0c
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 11120 bytes
SHA-256: d9d962ca1c81a169434de6ef212924bcfb287659867e93d26037237dd2137666